Global Situation

In the last 25 years of the 20th century, a dramatic global geographic expansion of epidemic DF/DHF occurred, facilitated by unplanned urbanization in tropical developing countries, modern transportation, lack of effective mosquito control and globalization.

The global prevalence of dengue has increased dramatically in recent decades. Dengue fever and DHF/dengue shock syndrome (DSS) occur in over 100 countries and threaten the health of more than 2.5 billion people in urban and peri-urban areas especially in south and south East Asia including Sri Lanka.